I'm new to this and not sure I'm approaching in the right way, but hoping to get some insight from anyone with knowledge on 2015 Enzo SV233. I'm looking to replace or upgrade some speakers in the downfire audio. Picked the boat up a month ago and pretty sure a few of the speakers are shot. Can I simply pull them out and replace like for like speakers? Would anyone know if the Focal sub I have has better options? Is it 10" or 12" stock? It seems to buzz a lot and not be very tight bass. If anyone has recommendations on best route for upgrading to get better performance out of it versus a complete replace of entire system, appreciate you input. I'm also trying to assess best batteries to get for it. Thanks in advance.